When it comes to accessories this spring, why make decisions?

The trendlet

Especially when a single-strand necklace (that's one look) can be doubled for a layered effect (that's two looks), or shortened to make a choker (that's three looks), or wrapped around your wrist as a bracelet. (Now, we've got four looks.)

Where does it come from?

Charm bracelets - we can thank Tiffany & Co. for introducing them to the mass market in 1889 - are among the earliest modern-day pieces designed to let wearers add and remove charms to change looks.

In the early '80s, the jewelry world started to see more interchangeable pieces, like watches with removable faces - think Benetton and Swatch. And then there were the Twist-a-Bead necklaces, which offered teenage girls the chance to match their jewelry to their outfits.

Fast-forward to after the 2008 recession, when entrepreneurial designers began introducing fashionable-yet-budget-conscious ideas, like shoes that convert from flats to heels, and wrap dresses that can be worn as maxi skirts.

But it was the jewelry entrepreneurs who found a sweet spot in fashion's fickle interchangeable world, said Karen Giberson, president of the Accessories Council. That's largely due to social-media sites like YouTube and Pinterest that give the creatives an outlet not to just sell their pieces, but to show their work.

Who is wearing them?

Anybody who wants a little bang for their fashion buck.

Would Elizabeth wear them?

I tend to be more of a minimalist.

Should you wear them?

Why not? They make vacation packing easy.

Where can you get them?

These wrap bracelets, $125, that can turn into necklaces come from E. Shaw Jewels,